We're dividing 88439178 by 399 
The aim is to understand the frequency of 399 in 88439178.

Going ahead to step 1:
8 divided by 399 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 399

On to step 2:
The number 399 fits into 88 0 times, leaving a remainder of 88.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 88 and we're left with 88.
Fetch the next digit (4) from the dividend, attach it to 88 and continue: 884 / 399

Going ahead to step 3:
When dividing 884 by 399, we get 2 with a remainder of 86.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 798 away from 884, we end up with 86.
Append the next digit (3) from the dividend to 86 and continue with: 863 / 399

Step 4:
If we divide 863 by 399, we get 2 and a remainder of 65.
Write down 2 as next digit of the result. 
Result so far: 22.0
If we subtract 798 from 863, we get 65.
Include the next digit (9) from the dividend after 65, then repeat: 659 / 399

Let's proceed to step 5:
If we divide 659 by 399, we get 1 and a remainder of 260.
Record the quotient 1 as the next digit in the result. 
Result so far: 221.0
Deduct 399 from 659 and we're left with 260.
Fetch the next digit (1) from the dividend, attach it to 260 and continue: 2601 / 399

Moving on to step 6:
2601 divided by 399 is 6 with a remainder of 207.
Use 6 as the next digit of our solution. 
Result so far: 2216.0
Subtracting 2394 from 2601 leaves us with 207.
Include the next digit (7) from the dividend after 207, then repeat: 2077 / 399

Moving on to step 7:
2077 divided by 399 is 5 with a remainder of 82.
Record the quotient 5 as the next digit in the result. 
Result so far: 22165.0
If we subtract 1995 from 2077, we get 82.
Append the next digit (8) from the dividend to 82 and continue with: 828 / 399

Going ahead to step 8:
399 goes into 828 2 times with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 221652.0
If we take 798 away from 828, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
The number 399 fits into 300 0 times, leaving a remainder of 300.
Put 0 as the next digit of the answer. 
Result so far: 221652.0
If we take 0 away from 300, we end up with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 10:
399 goes into 3000 7 times with a remainder of 207.
Put 7 as the next digit of the answer. 
Result so far: 221652.07
Deduct 2793 from 3000 and we're left with 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

Advancing to step 11:
When dividing 2070 by 399, we get 5 with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 221652.075
Subtracting 1995 from 2070 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 12:
When dividing 750 by 399, we get 1 with a remainder of 351.
The next digit of our result is 1. 
Result so far: 221652.0751
If we subtract 399 from 750, we get 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Moving on to step 13:
3510 divided by 399 is 8 with a remainder of 318.
Put 8 as the next digit of the answer. 
Result so far: 221652.07518
Subtract 3192 from 3510 to get 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Let's proceed to step 14:
The number 399 fits into 3180 7 times, leaving a remainder of 387.
Use 7 as the next digit of our solution. 
Result so far: 221652.075187
Subtract 2793 from 3180 to get 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Going ahead to step 15:
If we divide 3870 by 399, we get 9 and a remainder of 279.
Record the quotient 9 as the next digit in the result. 
Result so far: 221652.0751879
If we subtract 3591 from 3870, we get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Let's proceed to step 16:
The number 399 fits into 2790 6 times, leaving a remainder of 396.
Write down 6 as next digit of the result. 
Result so far: 221652.07518796
Deduct 2394 from 2790 and we're left with 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

The quotient of the division is 221652.07518796, and the remainder is 3.96e-07.